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A time varying voltage V= 2t (Volt) is applied across and ideal inductor of inductance L =2H as shown in Fig. Then (assume current to be zero at t =0) A. Current versus time graph is a parabolaB. energy stored in magnetic field at `t=2s is 4J`.C. Potential energy at time `t=1s` in magnetic field is increasing at a rate of `1J//s`D. energy stored in magnetic field is zero all the time. |
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Answer» Correct Answer - A::B::C `V=2t implies L(di//dt)=2t` `2(di//dt)=2T implies di//dt=t` `i=t^(2)//2 implies i-t "graph is parabola"` at `t=2s, i=2A` `U=(1//2)Li^(2)=4J` `dU//dt = Li(di//dt)=t^(3)=1 J//s`. |
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